Smart luminescent materials are widely used in anticounterfeiting for their exceptional features that are easy to authenticate, but hard to duplicate. In order to tackle authentication issues and tamper-proofing of printed documents, a new fluorophore, 2-(2-aminoethyl)− 5-hydroxy-1H-benzo[de]isoquinoline-1,3(2H)-dione (HNEDA) was prepared as a pigment to formulate an ink with unique security features for flexographic printing. The naphthalimide-based molecule obtained through an easy one-pot synthetic procedure was structurally characterised through spectral techniques. HNEDA displayed good thermal stability and photo-physical features. The flexo prints achieved using the water-based formulation of HNEDA on a UV dull paper substrate demonstrated yellow-orange fluorescence when viewed under ultraviolet light. Moreover, secondary security features were explored through the application of various solvents, acids, and bases on the print proofs. A unique phenomenon of penetrating fluorescence on the rear side of the printed substrate, which is difficult to forge but easy to authenticate was observed. This feature provides a distinctive and secure authentication mark to detect tampering in documents/cheques/banknotes etc. Further, the surface morphology analysis, abrasion resistance, colorimetric, and densitometry studies of the prints were also investigated. Furthermore, the p-type semiconducting property and high charge carrier mobility of the prints obtained on low-cost paper substrates using the water-based ink with HNEDA as the functional pigment showcased promising opportunities in secure flexible electronics.
|Journal||Colloids and Surfaces A: Physicochemical and Engineering Aspects|
|Publication status||Published - 20-11-2022|
All Science Journal Classification (ASJC) codes
- Surfaces and Interfaces
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry